Still leagues ahead of biomass. Don’t get me wrong, this is an issue that can be solved. Biomass can be converted to biogas which can be purified to produce methane (or you just burn biogas directly) which then in turn can be used for heat (or other purposes) - the problem here is the sheer amount of energy this requires. Yes, significant portions of the steel industry can be “decarbonised” (or at least I think so) but the effort is immense. Doable, necessary, but it will be a huge piece of work.
By “burn it” I meant turn it into charcoal… Charcoal averages 80% carbon (range 50-95%), whereas depending on the type coal ranges from 60-92% carbon, with the purest type, anthracite, being 86-92% carbon
Given a mass production system would likely result in more uniform carbon content near the top of the range, I don’t think it’s unreasonable to suggest that they could be swapped out pretty easily